CBD Oil in the UK: How to Choose a Legal, Lab-Tested Bottle

Start with the back of the bottle, not the front. "1,000 mg" is the total in the bottle, not what you take. Spread across 10 ml it is 100 mg per ml, so a single full dropper of a strong oil can deliver several times the daily amount the regulator now advises.

Step 1: Confirm the oil is allowed on sale

In England and Wales, CBD oils taken by mouth are regulated as novel foods, so a legal product is one linked to an application on the FSA's public list.

The register lets you search by product name or manufacturer and download the results. When we checked it in September 2026 it held 12,115 products and showed a last update of 13 April 2026. Look for the exact product, strength and size, not just the brand: a listed 500 mg oil does not cover the same brand's 3,000 mg bottle. Scotland's food regulator takes its own approach, and Northern Ireland follows EU rules, so this step is specific to England and Wales.

Step 2: Do the milligram math before you buy

The FSA's advice for healthy adults is a maximum of 10 mg of CBD a day. That figure, set as a provisional acceptable daily intake in October 2023, replaced the earlier 70 mg advice and protects against effects on the liver and thyroid seen in studies of pure CBD taken over long periods, according to the joint FSA advisory committees.

Drops vary in size between droppers, so use the graduation marks on the pipette rather than counting drops. For most people aiming at the FSA figure, a 3% to 5% oil is easier to measure than a 20% or 30% one. Labels that follow FSA guidance should print the CBD per serving and the 10 mg advice.

Step 3: Read the lab report, not the marketing

A certificate of analysis (COA) for the exact batch tells you what is in the bottle. Ask for it before buying if it isn't on the product page.

• Batch number matches — the number on the COA should match the number printed on your bottle.
• Accredited lab — the Home Office expects testing by laboratories accredited to ISO/IEC 17025; the certificate should name the lab and its accreditation.
• CBD close to the label — compare the measured mg per ml with the box.
• THC, delta-8-THC and CBN reported — each should be "not detected" or low enough that the whole bottle stays well under 1 mg of controlled cannabinoids.
• Date — a report older than the batch's production date, or with no date, proves nothing.
• Contaminants — better reports include pesticides, heavy metals and residual solvents.

Our line-by-line guide to reading a cannabis lab report shows what each column means.

How accurate are UK CBD labels?

Not very, on the best available UK evidence. Researchers at Loughborough University bought 63 CBD products online in the UK and measured the CBD.

The products were bought before the FSA's 2023 intake advice, so today's market may differ. The practical point stands: a batch-matched lab report from an accredited lab is the only way to know your dose.

Full-spectrum, broad-spectrum or isolate?

This choice matters more in the UK than in many markets, because of the THC rules.

Side effects and who should avoid CBD

The FSA advises against CBD for anyone under 18, anyone pregnant, breastfeeding or trying to conceive, and people taking medication, and says people who are immunosuppressed should consult a healthcare professional first.

The NHS lists possible effects of cannabis-based products including decreased appetite, diarrhea, nausea, tiredness and dizziness, and notes that CBD can affect liver function and interact with other medicines. The patient leaflet for Epidyolex, a prescription CBD medicine used at far higher doses than shop oils, lists sleepiness, decreased appetite and diarrhea among its most common side effects and raised liver enzymes as a known effect.

Claims and prices: quick sense checks

The Advertising Standards Authority noted in its 2024 rulings that no CBD claims were on the GB nutrition and health claims register, so a CBD food cannot claim to help with anxiety, sleep, pain or any condition unless a claim is authorized. Sellers that do so have been ruled against repeatedly; see the UK entries on our Red List.

• "Contains THC" or "gets you high" — either mislabeled or illegal.
• "Safe for children" — the ASA has ruled this claim misleading because it contradicts FSA advice.
• A very high strength at a very low price — ask for the COA; cheap high-strength oils are where label gaps tend to show.